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v3.5.0.2

Consolidated Balance Sheets - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Current assets |  |  |  |
Cash and cash equivalents | $ 254,210 | $ 102,335 | $ 120,469 |
Accounts receivable—trade, less allowance for doubtful accounts of $1,988 in 2016 and $1,963 in 2015 | 148,211 | 136,253 |  |
Inventories, at lower of cost or market | 152,494 | 155,906 |  |
Prepaid expenses and other current assets | 17,066 | 41,173 |  |
Total current assets | 571,981 | 435,667 |  |
Property, plant and equipment, at cost less accumulated depreciation and amortization of $732,114 in 2016 and $724,486 in 2015 | 1,430,816 | 1,369,318 |  |
Restricted cash | 53,853 | 68,571 |  |
Other assets | 27,196 | 12,685 |  |
Total assets | 2,083,846 | 1,886,241 |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 30,372 | 222 |  |
Trade accounts payable and accrued liabilities | 401,141 | 390,341 |  |
Income taxes payable | 24,184 | 0 |  |
Deferred income taxes | 0 | 1,729 |  |
Total current liabilities | 455,697 | 392,292 |  |
Long-term debt, including capitalized lease obligations | 648,266 | 490,160 |  |
Deferred income taxes | 177,570 | 161,236 |  |
Asset retirement obligations | 25,012 | 24,345 |  |
Deferred credits and other liabilities | 19,389 | 25,918 |  |
Total liabilities | 1,325,934 | 1,093,951 |  |
Stockholders' Equity |  |  |  |
Preferred Stock, par $0.01, (authorized 20,000,000 shares, none outstanding) | 0 | 0 |  |
Common Stock, par $0.01, (authorized 200,000,000 shares, 46,767,164 and 46,767,164 shares issued at 2016 and 2015, respectively) | 468 | 468 |  |
Treasury stock (7,603,706 and 5,088,434 shares held at June 30, 2016 and December 31, 2015, respectively) | (454,496) | (294,139) |  |
Additional paid in capital (APIC) | 551,977 | 558,182 |  |
Retained earnings | 659,963 | 527,779 |  |
Total stockholders' equity | 757,912 | 792,290 | $ 719,317 | $ 858,705
Total liabilities and stockholders' equity | $ 2,083,846 | $ 1,886,241 |  |

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- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4590271-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4568740-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4568447-111683 + Details
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- Definition The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 + Details
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